About Sizeaholic
Honest numbers about size and fit, built by people who care more about the math than the clicks.
Sizeaholic is built by the team behind Calcaholic.com, a site with more than a hundred calculators for everything from mortgages to GPAs. We spend our days making sure numbers are right. This site gives one topic that treatment full time: sizing.
Why this site exists
Sizing on the internet is a mess. A US shoe size means something different in the UK and something different again in the EU. Clothing sizes drift year by year as brands flatter their customers. Conversion charts disagree with each other, and much of what ranks in search results is marketing copy designed to sell you something rather than to answer your question.
So we build calculators on published standards and peer-reviewed research instead. Every tool on this site documents its formula, cites its sources, and shows a worked example, so you can check our work rather than take our word for it.
The same rules as Calcaholic
- Nothing you type is stored. Every calculation runs in your browser, on your device. Your measurements never touch a server. Our privacy policy spells it out.
- Every page shows its formula. You can see exactly how a result was computed and verify it yourself.
- Honest ranges, stated assumptions. We tell you where the data comes from and what it can and cannot say.
The tools
We launched in July 2026 and the site now covers three departments:
- Shoes: converters for US, UK, and EU sizes, men's and women's scales, kids sizes, and brand charts like our Converse size chart.
- Clothing & Accessories: ring size, hat size, bra size conversion, pant size, and bike frame size.
- Body & Intimacy: clinical, research-backed tools for condom sizing and size statistics, built on clinician-measured studies rather than internet surveys. The privacy rules above matter most here, and they are the same on every page.
If there is a size or fit question you wish had an honest calculator, tell us. That is how most of our tools get built.